feat: add user storied and definition of done to ticket and merge request templates

.gitlab/issue_templates/Bug.md

-# Bug
+# Bugs
 
 ## Description
 
-Just leave a short summary what the bug is about and where you came to notice it.
+Just leave a short summary what the bug is about and in which context you noticed it.
+Feel free to delete sections that doesn't suit the case you're dealing with.
 
-### I expected the following to happen:
+### I expected the following to happen
 
 …
 
-### On the contrary, I observed:
+### On the contrary, I observed
 
 …
 
@@ -48,8 +49,8 @@ How much impact does this bug have on the product or further development?
 
 Which version of the software did you use?
 
-## Related tickets
+## Related Tickets
 
-Add related issues (if applicable).
+Add related issues.
 
 /cc [Mathias Göbel](https://gitlab.gwdg.de/mgoebel), [Frank Schneider](https://gitlab.gwdg.de/schneider210), [Michelle Weidling](https://gitlab.gwdg.de/mrodzis)

.gitlab/issue_templates/Feature-request.md

-# Feature Requested
+# Feature Requests
 
 ## Description
 
 Just leave a short summary what the feature is about.
 
-## Use Cases
+## User Stories
 
-If you can, please provide use cases for this feature.
+As (role of the user) I need (what has to be done) in order to (what I want to achieve with this feature).
 
 ## Classification
 
@@ -17,6 +17,6 @@ Is this feature an enhancement of existing code or a completely new feature?
 
 ## Related Tickets
 
-Add all related issues (if applicable).
+Add all related issues.
 
 /cc [Mathias Göbel](https://gitlab.gwdg.de/mgoebel), [Frank Schneider](https://gitlab.gwdg.de/schneider210), [Michelle Weidling](https://gitlab.gwdg.de/mrodzis)

.gitlab/merge_request_templates/Bugfix.md

-# Bugfix
+# Bug fix
 
-Well, it seems that it is impossible to write software without bugs.
-That's why we are really happy that you are here.
-Thank you very much!
-Please take a moment to help us include the purposed bugfix by filling out the following form.
+Well, it seems that it is impossible to write software without bugs. That's why
+we are really happy that you are here. Thank you very much! Please take a moment
+to help us include the purposed bug fix by filling out the following form.
 
-## Summary
-
-Apart from what is mentioned in the main ticket you are going to close with this
-MR, tell us what you have done to achieve this goal.
+Feel free to delete sections that doesn't suit the case you're dealing with.
 
 ## Related Tickets
 
-Add all related issues and especially those to be closed.
-Keep in mind that every bugfix branch needs an issue that properly describes the bug beforehand.
-If your fix addresses something untracked, please open a ticket at first.
+Add all related issues and especially those to be closed. Keep in mind that every
+`bugfix` branch needs an issue that properly describes the bug beforehand. If your
+fix addresses something untracked, please open a ticket first.
+
+## Does the result of the MR comply to our "definition of done"?
+
+* [ ] Unit tests passed
+* [ ] Code reviewed
+* [ ] Acceptance criteria met
+* [ ] Functional tests passed
+* [ ] Non-Functional requirements met
+* [ ] Product Owner accepts the User Story
 
 ### Related
 
 ### Closes
 
+## Summary
+
+Apart from what is mentioned in the main ticket you are going to close with this
+MR, tell us what you have done to achieve this goal.
+
 ## Changelog
 
 * [ ] I added a statement to the CHANGELOG.

.gitlab/merge_request_templates/Feature.md

@@ -2,13 +2,22 @@
 
 We welcome every new feature to the upstream branch!
 
-But at first we ask you to fill in the following information about your feature.
-So please take a few minutes to make this great thing even better.
+Please fill in the following information about your feature.
+Feel free to delete sections that doesn't suit the case you're dealing with.
 
 ## Summary
 
 This MR provides…
 
+## Does the result of the MR comply to our "definition of done"?
+
+* [ ] Unit tests passed
+* [ ] Code reviewed
+* [ ] Acceptance criteria met
+* [ ] Functional tests passed
+* [ ] Non-Functional requirements met
+* [ ] Product Owner accepts the User Story
+
 ## Use Cases
 
 If you can, please provide use cases for this feature.
@@ -19,13 +28,12 @@ Shall we add your feature to the documentation?
 
 * [ ] I've already did it!
 * [ ] At least I added a headline to the documentation.
-* [ ] Not applicable
 
 ### Function Documentation
 
-* [ ] Of course I prepared all my functions with an appropriate documentation.
+* [ ] Of course I provided all my functions with an appropriate documentation.
 
-### Are There Parts of the Documentation We Have to Adjust?
+### Are there parts of the documentation we have to adjust
 
 * [ ] No.
 * [ ] Yes, but I'd like someone else to do it.
@@ -36,6 +44,7 @@ Shall we add your feature to the documentation?
 Are we able to test this new feature?
 
 * [ ] Yes, everything can be done via unit tests.
+* [ ] Yes, you can test by following these steps: …
 * [ ] No, it is not possible.
 
 ## Changelog